html, body {
    margin: 0;
    padding: 0;
}
ul>li{
    height: 30px;
    line-height: 30px;
    font-size: 20px;
    text-align: center;
    width: 100%;
    border: 1px solid #cccccc;

}
.box{
    width: 100px;
    height: 100px;
    background: url('../images/slot-game-img.png') no-repeat center content-box
}